new FTP site not allowing upload/download/rename/delete - Error code: 9 and 4

new FTP site not allowing upload/download/rename/delete - Error code: 9 and 4

Hi, I am accessing a new 'government' site, with pageant keys. After a successful login, I can move to a folder and see contents.

Attempting an upload gets:
Transfer was successfully finished, but temporary file name.filepart could not be renamed to target file name.
General failure (server should provide error description).
Error code: 4
Error message from server:
(none given, fyi)
Common reasons for the Error code 4 are:
- Renaming a file to a name of already existing file.
- Creating a directory that already exists.
- Moving a remote file to a different filesystem (HDD).
- Uploading a file to a full filesystem (HDD).
- Exceeding a user disk quota.

Trying to delete a file (that I uploaded via FileZilla) gets this:
General failure (server should provide error description).
Error code: 4
Error message from server:
(I get nothing reported)
Common reasons for the Error code 4 are:
- Renaming a file to a name of already existing file.
- Creating a directory that already exists.
- Moving a remote file to a different filesystem (HDD).
- Uploading a file to a full filesystem (HDD).
- Exceeding a user disk quota.

What can I tell them to change on their end? I can upload and download via FileZilla, but cannot rename or delete. I cannot upload/download/rename or delete with WinSCP.
Version 5.9.1 (Build 6885)

I thank you in advance, I cannot give out any more info as it is 'sensitive'. I use WinSCP for other sites, and just updated to 5.9.2 (same results).
Frank